Valar Atomics becomes first in the US to power an Nvidia chip with an advanced nuclear reactor

California nuclear startup Valar Atomics Inc. has generated electricity with an advanced next-generation reactor for the first time in US history and used it to power an Nvidia Corp. AI chip. The reactor produced only a token amount of power, Bloomberg reports.

What exactly happened

This was a demonstration startup, not commercial power generation. For the first time in the US, a next-generation reactor produced electricity, and that electricity ran an Nvidia chip used for AI workloads. Bloomberg stresses that the output was minimal — "just a trickle of electricity" — but the fact that a reactor of this type has operated on US soil for the first time is considered a significant technological milestone for the industry.

• Company — Valar Atomics Inc., a nuclear startup from California
• Event — the first time in the US that an advanced next-generation reactor has generated electricity
• The power was used to run an Nvidia Corp. AI chip
• Output — symbolic; no operational scale yet

Why AI data centers need new nuclear power

Training and running large language models takes enormous and ever-growing amounts of electricity. In many regions, existing grids already struggle to keep up with demand from data centers that house clusters of chips such as Nvidia's. That is why several major tech companies have signed deals in recent years with nuclear plant operators and developers of compact next-generation reactors. The goal is to supply AI data centers with reliable, low-carbon power without depending entirely on the traditional grid.

Next-generation reactors — so-called advanced or small modular designs — are being developed as a more compact alternative to conventional nuclear plants, and one their developers intend to be faster to build. Until recently, these projects mostly remained in development, licensing, and testing. A real physical startup that produces electricity, even a token amount, is a notable step beyond purely paper and lab stages.

What it means

The small-scale startup of Valar Atomics' reactor points to where AI energy may be heading: attempts to tie advanced nuclear technology directly to specific computing hardware at the very earliest, demonstration stage — long before such reactors can cover any meaningful share of data center power consumption.